get_time_provider
Description:
Get the TimeProvider for the clock used by this.
 The time provider will listen on address and port for client time requests.
Parameters:
| this | 
           a Media  | 
      
| address | 
           an address or null  | 
      
| port | 
           a port or 0  | 
      
Returns:
| 
           the TimeProvider of this.  |